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Criminal Investigation

RJ Lee Group is recognized as a leading authority in criminal forensics, with particular expertise in gunshot residue (GSR) analysis. We work collaboratively with hundreds of agencies across the United States and internationally, providing scientifically sound and impartial forensic support.

We partner with law enforcement agencies, prosecutorial offices, public defenders, private defense attorneys, private investigators, and other forensic laboratories, supporting investigations and legal proceedings through objective analysis and clear communication of results. Our forensic scientists are highly experienced testifying experts, with extensive deposition and trial experience in state and federal courts across numerous U.S. jurisdictions and abroad, for both the prosecution and the defense.

Our litigation support services are grounded in a strong respect for the legal process, a thorough understanding of scientific and technical issues, and a commitment to presenting forensic data with accuracy, clarity, and credibility. Our role is to equip clients with reliable scientific information and expert insight to support informed decision making in complex cases.

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Stronger Cases Start With Better Science

Whether you're preparing for trial, reviewing prior lab work, or training your team on evidence collection, our scientists support law enforcement and legal professionals at every stage of a GSR case:

 

Consulting Services

Expert review of laboratory analyses and forensic reports to identify potential issues or inaccuracies in prior testing or testimony, or to help strategize the usage of these results.

 

Expert Witness Services

Clear, credible testimony based on solid scientific evidence to support legal proceedings and case resolutions.

 

Training

Proper collection of GSR and interpreting results in the context of real-world investigations and legal proceedings.


Presentations

Client-curated presentations explaining gunshot residue collection, analysis, and interpretation.

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Representative Clients

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Law Enforcement Agencies
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Public Defenders
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Prosecutorial Offices
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Private Defense
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Private Investigators

"In addition to doing outstanding work on the testing of important evidence, RJ Lee offers seasoned experts that will do a great job testifying. More importantly, they will take all the time needed to prepare an attorney for presenting the evidence in a way a lay person jury can understand." 

 
Amy Jacobsen
Deputy Douglas County Attorney
Omaha, NE
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Our Approach

RJ Lee Group’s approach to criminal forensics is grounded in scientific rigor, validated methodologies, and an understanding of legal relevance. Our forensic scientists apply careful analytical practices and professional judgment to ensure each examination is thorough, accurate, and defensible within investigative and courtroom settings.


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Key Services
 
What Sets Us Apart

 

RJ Lee Group is distinguished by our ability to deliver fast, reliable turnaround times without compromising scientific rigor, even in complex or high volume gunshot residue (GSR) casework. Our laboratory routinely supports time sensitive investigations and agencies managing significant backlogs.
Equally important is the depth of experience of our forensic scientists. Our experts are highly experienced testifying professionals, with extensive testimony experience in state and federal courts across numerous U.S. jurisdictions and internationally. They are trusted to explain complex forensic findings clearly, accurately, and objectively.


This combination of efficient analysis, technical precision, and courtroom experience allows RJ Lee Group to support investigations and legal proceedings with confidence, clarity, and professionalism.

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Gunshot Residue Analysis

RJ Lee Group provides primer gunshot residue (GSR) analysis using SEM/EDS, a well established method for identifying microscopic primer residue particles. Our scientists analyze samples collected from hands, clothing, vehicles, and other surfaces relevant to firearm related investigations. With extensive casework and courtroom experience, our experts deliver accurate, clearly communicated results that are appropriate for investigative decision making and testimony in legal proceedings.

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Strengthen Your Investigative Strategy

RJ Lee Group supports investigations with reliable forensic science, from SEM/EDS gunshot residue analysis to expert testimony. Led by Tarah Helsel, our experienced team delivers accurate analysis and clear explanations appropriate for legal and investigative settings. Connect with Tarah today to discuss how we can support your case.
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